From b5d9c7cd3ff392151bccc4f387e2fdb26c6254cf Mon Sep 17 00:00:00 2001
From: Johanness <mrjitten@protonmail.com>
Date: Sat, 30 May 2026 23:13:24 +0300
Subject: [PATCH] fix decklink-out: init grains_read from current time to avoid
 epoch realignment

---
 nodes/decklink-out/src/decklink_out_node.cpp | 7 +++++++
 nodes/decklink-out/src/decklink_out_node.hpp | 1 +
 2 files changed, 8 insertions(+)

diff --git a/nodes/decklink-out/src/decklink_out_node.cpp b/nodes/decklink-out/src/decklink_out_node.cpp
index e51a641..d836a9b 100644
--- a/nodes/decklink-out/src/decklink_out_node.cpp
+++ b/nodes/decklink-out/src/decklink_out_node.cpp
@@ -226,6 +226,13 @@ void DeckLinkOutNode::process() {
         return;
     }
 
+    if (first_frame_) {
+        auto now = mxlGetTime();
+        grains_read_ = mxlTimestampToIndex(&output_rate_, now);
+        first_frame_ = false;
+        spdlog::info("DeckLink-out: starting at output index {}", grains_read_);
+    }
+
     auto deadline = mxlIndexToTimestamp(&output_rate_, grains_read_ + 1);
     mxlSleepUntil(deadline);
 
diff --git a/nodes/decklink-out/src/decklink_out_node.hpp b/nodes/decklink-out/src/decklink_out_node.hpp
index ea0ec26..1dbcf8a 100644
--- a/nodes/decklink-out/src/decklink_out_node.hpp
+++ b/nodes/decklink-out/src/decklink_out_node.hpp
@@ -45,6 +45,7 @@ private:
     mxlRational output_rate_{50, 1};
     uint64_t read_index_ = 0;
     uint64_t grains_read_ = 0;
+    bool first_frame_ = true;
 
     int device_index_ = 0;
     BMDDisplayMode display_mode_ = bmdModeHD1080i50;